Clinical Trial Details
— Status: Recruiting
Administrative data
| NCT number |
NCT05112588 |
| Other study ID # |
VGFOUREG-969450 |
| Secondary ID |
|
| Status |
Recruiting |
| Phase |
N/A
|
| First received |
|
| Last updated |
|
| Start date |
November 1, 2021 |
| Est. completion date |
December 31, 2030 |
Study information
| Verified date |
June 2024 |
| Source |
Vastra Gotaland Region |
| Contact |
Margareta I Hellgren |
| Phone |
+46708381612 |
| Email |
margareta.leonardsson-hellgren[@]vgregion.se |
| Is FDA regulated |
No |
| Health authority |
|
| Study type |
Interventional
|
Clinical Trial Summary
Gestational diabetes is the most common metabolic abnormality during pregnancy. In a Swedish
population 2-10% of all pregnant women are diagnosed with gestational diabetes mellitus
(GDM). The frequency differs dependent of methods for screening and diagnostic references,
even within Sweden. Women with GDM have about 50% risk to develop manifest type 2 diabetes
(T2DM) within 20 years. Most counties in Sweden have a recommendation to follow women with
GDM yearly with an examination and an oral glucose tolerance test (OGTT). Unfortunately, this
recommendation often fails, partly due to limited resources at the health care units but also
due to lack of compliance from the women. Often after the baby is born focus is changed from
the mother to the child and only 30.7% of the women with one or more risk factors performed
an OGTT, despite stipulated OGTT in local guidelines.
The diagnose GDM is under debate and Sweden has started to implement the recommendations from
World Health Organisation (WHO) from 2013 with a lower cut-off for GDM, which will increase
diagnostic sensitivity and consequently increase the number of women diagnosed with GDM. The
plan was to conduct a randomized, clinical trial testing implementation the new
recommendations in Sweden step-wise from 2018 and onwards. The recruitment is now complete
and the results are expected to be published in 2021.
The overarching aim of this study is to conduct a randomized, controlled clinical trial to
test the effect of a model for a lifestyle intervention in clinical practice, using technical
support as well as personal, individual support. The intervention is based on the existing
organisation and structure in Primary Care and would thus be inexpensive and straight-forward
to implement. An additive aim is to explore background mechanisms for the development of type
2 diabetes in women with gestational diabetes.
Description:
Survey of the field Gestational Diabetes Mellitus (GDM) is increasing in the world today and
is strongly correlated to adverse outcomes both for the baby and the mother. The prevalence
differs considerably depending on screening recommendations and diagnostic criteria and is
increased among women with obesity. Both the mother and the child face higher health
challenges, including manifest T2DM, over the years to come due to GDM. In turn, type 2
diabetes increase the risk of cardiovascular disease, nephropathy, retinopathy and
neuropathy. Based on the results of the HAPO study, the International Association of Diabetes
and Pregnancy Study Groups proposed new criteria for GDM in a consensus statement in 2012.
Adopting a one-step strategy would at least double the number of women with the diagnose GDM.
Sweden has started to implement the new diagnostic criteria step-wise in different counties.
For diagnostic criteria, see Table 1.
Table 1. Diagnostic criteria for gestational diabetes
Gestational fP- glucose* 1-hour 2-hour glucose(venous) According to EASD 1991 ≥7.0 mmol/L ≥9
mmol/L
- 10mmol/L (capillary) According to WHO Since 2013 ≥5.1 mmol/L ≥10.0 mmol/L ≥8.5 mmol/L
1. and 2-hour glucose after ingestion of 75g glucose after an overnight fast.
*fP-glucose= fasting plasma glucose
The metabolic demands of pregnancy can reveal a predisposition for T2DM, especially within 5
years postpartum. Women with GDM are eight times more likely to develop T2DM than women with
normoglycemic pregnancies. Risk factors for development of manifest T2DM are common and
well-known; 1) Overweight 2) Ethnicity 3) Low level of physical activity. 4) Heredity for
T2DM. Women with first degree relatives with T2DM have an increased risk to develop T2DM.
Considering all the risk factors it is possible to influence both weight and physical
activity and even if women with GDM are called for a follow up the first year after delivery,
they are often left on their own thereafter to implement lifestyle changes and pursue a
healthy life-style. This, while the child/children require care and often are the focus of
the family. The planned intervention is based on already existing routine care added by
information to the nurse at the Child Health Care Centre and a supportive website, specially
developed for women at risk to develop T2DM.
Background to the exploratory aims Women with GDM have demonstrated aberrations in lipolytic
markers in addition to disturbances in glucose metabolism, eg increased fasting blood free
fatty acids (FFA) compared with healthy controls as well as an impaired anti-lipolytic effect
of insulin. Abundance of FFA have also been implicated in the development of type 2 diabetes
(T2DM) and are also an independent forerunner of T2DM in at-risk populations. An infusion of
FFA has been shown to reduce insulin-stimulated uptake of glucose in skeletal muscle.
However, the effect FFA on insulin secretion is not resolved, with both increase as well as
decreased insulin release being reported. Because GDM subjects are at high risk of transition
to T2DM, they constitute an attractive prediabetes group for studies of associations between
FFA abnormalities and markers of insulin secretion and insulin resistance. Although, there
are several reports on the role of FFA for insulin secretion in GDM no study with enough
power has evaluated the relationship in well-matched groups of GDM women and healthy controls
in carefully phenotyped subjects. In this study, the intension is to follow fasting FFA,
fasting C-peptide, fasting insulin and repeated measurements of these variables for 2 hrs
after an OGTT in GDM women out of pregnancy and compare effect of lifestyle intervention with
that of care as usual during 5 years. Thus, metabolically healthy women without previous GDM
who are out of pregnancy will be enrolled as a reference population. In particular, it is of
great interest to test the hypothesis that fasting FFA could be a driver of insulin secretion
in normal fasting glycaemia and whether weight reduction may suppress fasting insulin
(evaluated in part by HOMA-IR) and FFA in parallel. This sheds light on fundamental metabolic
questions in the pathogenesis of GDM and T2D.
Digital support and coaching Mobile technology has been used to treat a variety of clinical
conditions, for lifestyle interventions regarding physical activity and diet as well as
quitting smoking. For diabetes prevention there are a number of studies with varying
methodology (mainly messages on the mobile phone) and most of them have a relatively short
follow-up time and have focused on changing weight or HbA1c. In a review article from 2017,
the interventions are often assessed as cost-effective. Three success factors are mentioned;
automatic transmission of the patient's measurement data rather than manual entry by the
patient, tailor-made personal messages or the addition of direct face-to-face contact, and
the intervention being in a context where participants can interact with each other.
MyMOWO - The application and website used in this lifestyle intervention is MyMOWO
(www.mymowo.com) which is an established company that offers physical training and activity
with over 250 different training sessions of various intensity and scope through digital
management and support. The service can be accessed using modern technology, such as mobile
phone, tablet or computer, via webpage, application or social media. A licenced
physiotherapist at the public health unit in Region Jämtland Härjedalen has together with
MyMOWO developed special training programs for pregnancies and obesity. These groups also
make it possible for MyMOWO's personal trainers to stay in contact with the participants. All
participants in the intervention group will receive access to MyMOWO for free with automated
support.
In this digital platform links will be given to information films regarding nutrition, the
benefit of lifestyle and physical activity, stress, sleeping habits and tobacco. This from
www.sundkurs.se. These are films by Prof. Mai-Lis Hellénius produced by the Karolinska
Institute and the patient organization Hjärt-Lungfonden and they are used with permission in
this project.
The planned intervention is based on already existing routine care added by an interactive
digital service specially developed for women at risk to develop T2DM, information to the
nurse at the Child Health Care Centre.
Characterization of the phenotype in the PEPP Diabetes study Medical history, socio-economic
and lifestyle factors: Standard questionnaires will be used to gain information on previous
hospitalisations, on smoking and alcohol habits and on physical activity, leisure time as
well as at work. A well validated questionnaire will be used to report diet (MiniMeal-Q).
Physiologic measures: The nurses will measure standard resting blood pressure two times 1
minute apart after five minutes rest with the subjects in a sitting position. (Right brachial
artery, arm in heart level, cuff size adjusted for arm circumference, and reading the
pressure at the closest 2 mmHg). Body mass index (BMI) and waist hip circumferences are
measured using standard methods. All participants will be examined with a bioimpedance
measurement at base-line, after one year and at follow-up. All participants will also have
their oxygen uptake capacity (VO2max) measured with a bicycle test (Ekblom-Bak) and their
physical activity measured with an accelerometer, and a pulswave-measurement will be
performed at baseline, after one year and at end-of-study.
Clinical chemistry: Venous blood samples will be collected after an overnight fast. HbA1c,
glucose, insulin and cholesterol (HDL, LDL, total cholesterol and triglycerides) will be
analysed without delay. Aliqouts of blood, plasma and serum will be frozen immediately at -82
degrees C. A standard oral glucose tolerance test (OGTT) is done in all participants. Insulin
secretion and insulin sensitivity is estimated using the HOMA indexes [37], and for insulin
secretion also the increment during the first 30, 60 and 90 minutes of the OGTT. Further
sera, plasma, and whole blood (for DNA) are stored in a biobank at Gothenburg University.
First-voided urine on waking in the morning is collected to determine the albumin-creatinine
ratio. Samples will be collected at baseline, after one year and at end-of study.
Statistical analyses:
Both women diagnosed with gestational diabetes according to the "old" (before 2013) and "new"
criteria will be included and will be analysed both jointly and as separate subgroups (see
table 1). Power calculation is based on data using the old criteria. Inclusion will continue
until the number of women with gestational diabetes based on the old criteria is included
according to the power calculation.
Power calculation: Around 30% of the participants are expected to convert to T2DM after 5
years without intervention. The effect of the intervention is expected to be around 35% with
less individuals progressing to T2DM. According to the power calculation a total of 150
participants will be needed in each group for interindividual comparisons between the
intervention and "care as usual" group. Recruitment is planned for three years. Participants
will be randomized to either intervention or care as usual in equal numbers (150 in each
group). The participants will be stratified according to age, BMI and ethnicity. Data from a
number of 150 healthy women with normal with normal glucose tolerance will also be collected.
Individuals progressing to the primary endpoint will be compared with logistic regression and
adjusted for baseline data concerning glucose variables, age, BMI, ethnicity, time in study
and socioeconomic factors. Differences between changes in BMI, waist-circumference, insulin
resistance and HbA1c will be calculated with general linear models (GLM) and adjusted for the
same variables, Differences in quality of life will evaluated using Mann-Whitney test. Women
who get pregnant during the study time will be examined as soon as the new pregnancy comes to
the knowledge of the coordinator and be excluded from the final analyses but will asked to
remain in the study.
Data from the women with normal glucose will be collected and matched with data from the
women with GDM.
Initially the aim is to conduct a pilot study over one year to test the protocol.
Study time line
As participation in the follow-up after delivery at the health care unit is often low we plan
to base the intervention on the regular and well-attended meetings at the Child Health Care
Centre. The intervention will be based on information from the Maternity Clinic to Child
Health Care Centre.
The maternity center and two months after delivery. The women will get information orally and
in writing about the study. A metabolically healthy women will be matched and given
information about the study.
4 months post-partum If the woman agrees to be contacted she will be referred to the study
center and examined with a physical examination and blood samples.
Examination (by the study nurse):
Anthropometric measurements: Bloodpressure, body weight and height, hip and waist
circumference. Bioimpedance and pulse-wave measurements.
Questionnaires: Diet, Life-style, socioeconomic data. Fitness: The Ekblom-Bak submaximal
bicycle test. A accelerometer will be applied during ten days.
Blood sampling: Blood samples for plasma glucose, HbA1c, cholesterol (high densitiy
lipoprotein, low density lipoprotein and triglycerides) an oral glucose tolerance test (OGTT)
will be analysed at once. Samples of whole blood, serum and plasma will be kept and preserved
in the biobank.
If informed consent is signed the women will be randomized to intervention or care as usual.
Matched controls from a group of women with a metabolically normal pregnancy will be examined
in parallel.
Intervention: At all visits at the child health care centre women in the intervention group
will be reminded concerning physical activity and diet and blood-samples will be taken for
fasting plasma glucose, HbA1c, weight and waist-circumference and the nurse at the child care
clinic will give feed-back concerning the tests. The participant will be supported concerning
physical activity and diet at every visit at the clinic on-wards.
The participants in the intervention group will also be informed and given support through a
health coach service in V:a Götaland aimed to support lifestyle changes, and by an
application, MyMOWO to support lifestyle changes, increase their knowledge of
lifestyle-related issues, improve physical activity and dietary habits. The "Hälso-coach"
service may be available in other parts of the country, using other names and will be used if
available.
At all visits at the child health care centre the participants in the intervention group will
have their blood glucose, HbA1c, weight and waist-circumference measured. The nurse will give
support concerning physical activity and diet and give feed-back concerning the test results.
The participant will be reminded of physical activity and diet at every visit at the clinic
on-wards (at most once a month). If the women is diagnosed with either IFG, IGT or have an
HbA1c ≥42 mmol/mol the nurse responsible for diabetes care at the health care center will be
contacted for action in accordance with standard of care. The women will keep the regular
controls at the Child care clinic.
Care as usual: This group of GDM women will be provided care according to health care routine
and referred to the health care centre.
This extensive examination will be repeated 18 months and four years after delivery.
Dataprotection Data will be secured in a protected database on a special server in the Vastra
Gotaland. All data will be anonymized and coded. Only the responsible researchers will have
the code.
Data collection will be monitored by an independent monitoring service from the Gothia Forum.
